## Precalculus (6th Edition)

domain: $\left\{x| x \ge 0\right\}$
In $g(x) = \sqrt{x}$, the value of $x$ can be any non-negative real number. The value of $x$ cannot be negative because there is no real number that when squared gives a negative value. Thus, the domain of the function in Exercise 6 is: $\left\{x| x \ge 0\right\}$